EC 3749 then LA 5789 at Barcelona
Milan → Barcelona → Seville
Timetable, Barcelona time
21:30EC 3749 from Milan at the gate
11:45LA 5789 to Seville leaves the gate
14 h 15 apart on the timetable, overnight
LA 5789 leaves 14 h 15 after EC 3749 arrives on the timetable: more than half a day, so not a connection we count.